实现自定义排序

bands是一个歌曲名数组，在排序时忽略字符串中含有的"The" 字母

1.先看看默认的排序
          var bands:Array = ["The Clash","The Who","Led Zeppelin",
                             "The Beatles","Aerosmith","Cream"];
          bands.sort();
          for(var i:int = 0; i < bands.length; i++)
          {
              trace(bands[i]);
          }
          输出：Aerosmith
               Cream
               Led Zeppelin
               The Beatles
               The Clash
               The Who
2.自定义排序函数

如果要自定义排序，可用sort( ) 方法和自定义比较函数。sort( ) 方法重复调用比较函数对两个数组元素进行比较，比较函数接受两个参数即数组元素（我们称为a和b），根据具体的排序方式返回正数，负数或0。如果返回负数，a排在b前(a<b)，如果返回0(a=b)，位置不变，如果返回正数(a>b)，a排在b后，直到所有元素对比完毕。

           var bands:Array = ["The Clash","The Who","Led Zeppelin",
                             "The Beatles","Aerosmith","Cream"];
          bands.sort(bandNameSort);    //传自定义函数bandNameSort
          for(var i:int = 0; i < bands.length; i++)
          {
              trace(bands[i]);
          }
          /*输出
             Aerosmith
           The Beatles
           The Clash
           Cream
           Led Zeppelin
           The Who
        
        

         private function bandNameSort(band1:String,band2:String):int
          {
          band1 = band1.toLowerCase();
          band2 = band2.toLowerCase();
          if(band1.substring(0,4)=="the ")
          {
          band1 = band1.substring(4);
          }
          if(band2.substring(0,4)=="the ")
          {
          band2 = band2.substring(4);
          }
          if(band1<band2)
          {
          return -1;
          }
          else
          {
                return 1;
          }
          }